Process of making lamp structure.



0. om]. PROCESS OF MAKING LAMP STRUCTURES.

APPLICATION FILED DEC-9,1914.

Patented Mar. 21, 1916.

2 SHEETS-SHEET I.

0. MORU.

PROCESS OF MAKING LAMP STRUCTURES.

APPLICATION HLED DEC. 9. I914 Patented M31. 21, 1916.

2 SHEETS-SHEET 2-.

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cant mono, or nnnosnn, Wisconsin, assrsnon TO THE nnncnn nnass rare.00., or xnnosne, WISCONSIN, A oon-ronarron or WISCONSIN.

PROCESS OF .MAKING LAMP STRUCTURE;

messes. Original application filed June-5, 1914,

of the United States, anda resident of Kenpsha, in the county of Kenoshaand State of Wisconsin, have invented 'certaln new and usefulImprovements'in Processes J of Making Lamp Structures, of which thefollowing is a specification.

lhis invention relates to improvements in processes of making lampstructures, and, although it may be applied to various uses,is'particularly well fitted for use in connection with the manufacture"of automobile head lights employing a parabolicreflector and a'stampedlocking ring for-holding the position in front ofthe reflector.

a divisional applica-v glazing in This application is tion from myoriginal'application filed June 5, 191 i, Serial No. 843,160.

Among the salient objects of the invention are to provide in a structureof the type referred to an improved process of manuiacturing the bowlmember and the rin memloerv from a single blank .by ,means or asuccession of suitable stamping or other 111311111 -fracturingoperations; to provide a manufachich, when util zed in the turing:process w v construction'of a structure of-the type referred to, shallresult in a substantial saving in material and in labor,-and whichenables 1 the resulting product to be completed with a high degreeofgaccurayin fit and finish with a, comparatively small number of op-=erations, and, in general, to rovid an improved process of the type reerred to.

In the drawings-Figure 1 shows inele ration-a small automobileheadlight-em .bodyinglmy construction]; Fig. 2 isa section along tfragmentary steamer the ends of the loclt ing ringa'ndassociated lockingmeans; and. Fig.4 isfa fragmentary enlarged" I lower portion or;

"yiewof the ri 2;. vri

view showing the r flector and the locking ring during one. of. theinitial stages of man- -1'1fa'cture;, 6*is a fragmentary section alongtheline 6 -6 of'Fig. 5; Fig. 7 is a. fragrnehtary section of thereflector and locking rifigat a later point in the menus facturlngprocess; Fig. 8 is an axial section of the finished reflector bowl; andFig.- 9 is locking ring 6 is expanded for a shortfdis 'tancefrom itsendto pro'vide a telescopic locking ring are" forced is a plan- '17, whichpasses through a small hole in the Specification of Letters Patent.Patented Blair. 21., 1916,

Serial No. 843,160. Divided and this application filed December 9,

1914. Serial No. 876,231.

a a plan view of the locking ring after the last forming operation.

Referring to'the drawings, 1 represents the outer shell of the lamp,which, as'shown, is stamped or spun from a single piece of metal, and isso shaped as to completely in close the reflector 2. To each side of thelamp is riveted a boss 3*, which is provided with a vertical hole to fitone of the lamp forks. The outer edge ofthe shell 1 is rolled over toforma finishing bead 3 at-the edge of the flaring portion of. the lamp,and Within the latter are formed the circurnfcrential seat t fortherefiectorland the circumferential groove 5', within which is seated theential groove 5,. within which is seated the locking'ring 6.- Theparabolic'reflector 3 is suitably orificed at the rear to a'dmit thelamp-socket 7, the'lamp'proper being indicated iii-dotted lines at 8,and the front edge of the reflector is pressed out to form a flangedportion 9 for the proper diameter to seat in the circumferential recess4 of the .Referring now to the specific construction 1 pi the lockingmeans, it will be-s een from an inspection of Fig; 3 that. one endof thev at.

sheath portion 11, which laps over the other .end 12 of the locking ringand isndapted to. slide; thereon when the two ends ofthe' v apart.Gircumfer ty l tial znovement ofi'the fined end 12 oil'j'the" *loclii''gf rlng is prevented by a pin 13 which ts-engaged by the end of ablcclnll whichl' IS SOIdQIQd to the underside of the endj lft of thelocking ring. To the outer shell)" the lamp is riveted a hollow box-likestamp,-

ing 1'5, which forms a slideffor the outerend of a wedging dog ,16. Theouter end of the latter is tapped to receive a locking screw end of theslide-box 15 and engages the outer end of the latterwhen the W4 lgingscrew. The inner end of the wedging dog' 16 is formed with aninwardly-extending cam-hook 18 which engages the end of a small punching19 soldered to the movable end of the locking ring. The hook end 18passes through and slides in a. circumferentially extend slot 20 in theouter shell. p

In assembling the various parts of the lamp, the reflector 2 is firstplaced in its seat in the outer shell. 1 and the glazing applied to theend of the reflector. The locking rin then inserted by first placing theend in the circiunferential groove 5 of the outer shell in suchaposition that the block 1 2: engages the pin 13. The remaining portionof the circumference of the locking ring is then worked into the slot,

pressure being at the same time maintained in a direction to hold theblock 14: against the pin 13, and finally the free end of the lockingring drops into the groove. It should be noted that, before the lockingring can be assembled, it is necessary to unscrew the catch member 18 toits fullest extent, so that it will not interfere with the member 19 toprevent the free end of the locking ring from entering the groove. Whenthe locking ring is in placeyit is then positively locked in position.by screwing up the member 18 into the position shown in Fig. 3. Toremove the ring, after loosening the screw 17 and forcing back thewedging dog 18, it is necessary to insert the point of a knife or otherinstrument between the overlapping portion 11 of the locking ring andthe outer shell.

Clhelocking ring 6 is formed of nickeled brass or other metal capable oftaking a good finish, and is of such width and shape as to form anornamental trim around the glazing opening, harmonizing with the generalshape of the lamp. The depth of the section is also. such that when thelocking ring is forced tightly outward, due to the action of the wcdgingdog 16, the glazing and reflector are wedged tightly in position, andthe construction is thereby rendered very secure and free from rattle orthe possibility'of vibration loosening up any of the parts.

. The process of making the locking ring and reflector, which comprisesthe subject matter of this application and of the inventicnclaimed'herein, will now be described.

Briefly, the process consists in manufacturing the parabolic reflectorand the locking ring from a single blank, the parabolic reflector beingformed concentric with and within the locking ring, which is afterwardsevered from the reflector and then divided radially and formed as toits two ends so to provide an overlapping ring of the proper diameter.

Referring to Fig. 5, 21 represents a blank of brass or other suitablematerial after the combined reflector and locking ring have been formedto the proper shape, before the This initial forming tearing of themetal. During these preliminary forming operations, the metal around theexterior of the circular formed portion of the blank inust be held. verysecurely against inward radial creeping movement due to the action ofthe dies, and in order to do this, it is necessary to provide around theedges of the circular portion enough width of metal so that pressure maybe applied to the exterior of the blank by means of suitable spring padsto prevent this creeping action. This always results in a great loss ofmaterial when making a reflector or similarly formed part. The making ofthe looking ring as a single part would result naturally in a similarwaste of material. It will thus be self-evident that by forming thereflector and the locking ring in a single piece, effect a saving inmaterial equal to the size of a blank large enough to make the reflectoralone, besides eliecting a considerable reduction in the number offorming operations. After the blank attains the shape shown in Figs. 5and'6, it is then subjected to a trimming operation, which removes thecorners 22 and also punches the hole 23 in thebottom of the reflectorbowl.

After "the combined ring and bowl have thus been trimmed, it issometimes necessary to perform an additional beading operation, whichgives ,the

required shape to the outer edge of the lockas shown in Figs. 2 and 4,it is neccssary'to 4 effect a considerable reduction in its diameter,which is accomplished by cutting the ring radially and removing aportion of its circumference, the'endsbeing overlapped, as shown in Fig.9, so that the locking mechanism for the ends of the ring may beapplied. Owing to this reduction in the diameter of the ring when itoccupies its position in the lamp, the ring itself has a very strongtendency to spring outwardly and resume its original diameter. Thisresults in a very secure and substantial construction, which is rendereddoubly effective by the locking means previously described.

Although I have illustrated my invention as being employed in themanufacture of an automobile headlight, it is manifest that the otheranalogous structures,

invention can be used in the construction of and therefore I do not wishto be limited to {the details of the process described, except asspecified in 5 the appended claim.

I claim In lamp manufacture, the iirocess'Of-manufacturin a cooperatingglazing-lockin ring and-para olic reflector from-a single glank,

10 which consists in taking aflat blank, shaping the reflector and thelocking ring concentricall'y and integrally together in said blank,trimming the exterior o the formed blank

